Explosion unbuckling device

Abstract

The utility model belongs to the field of petroleum and natural gas exploration, and particularly relates to an explosion unbuckling device which comprises an upper connector, a lower connector and an upper connector, a hollow cavity is formed in the upper connector, a buffering assembly is arranged in the hollow cavity, a sealing contact pin is installed in the center of the bottom end of the upper connector, and a pan head screw is connected to the eccentric position of the bottom end of the upper connector in a threaded mode. The union nut is in threaded connection with the outer surface of the bottom end of the upper connector, the bottom end of the union nut is in threaded connection with a detonator cavity body, an electric detonator is installed in the detonator cavity body, one leg wire at the top of the electric detonator is connected with a sealing contact pin, and the other leg wire is connected with a pan head screw; the lower end of the electric detonator is connected with a detonating cord. The device can smoothly realize the explosion unbuckling function, is simple to manufacture, convenient to use and high in explosion unbuckling success rate, and has the advantages of short operation time, low cost and the like, the fish top is flat and regular after operation, and good conditions are created for subsequent treatment operation.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and natural gas exploration, in particular to an explosive release device. Background Art

[0002] During oil drilling, stuck drill bits are the most common drilling accident. In many cases, we cannot simply rely on moving the drill bit up and down, using a jar to jar it up and down, or soaking it in oil to unstuck it. Especially when foreign matter or differential pressure causes drill bit sticking in the well, most of these situations manifest as maintaining normal mud circulation, but the drill bit cannot move up and down or rotate in the well, that is, the stuck drill bit is completely stationary in the well. In this case, explosive loosening technology is an effective solution to the stuck drill bit accident encountered during drilling. This technology uses blasting at the drill bit stuck point, using the instantaneous high temperature, high pressure, and shock wave generated by the explosion to produce elastic deformation at the drill bit joint, thereby opening the joint without damaging the drill bit, and achieving the purpose of quickly releasing the drill bit above the stuck point.

[0003] In the disclosed related technologies, there are also dedicated explosive loosening devices, but the overall production and operation are complex, which increases the difficulty and cost of explosive loosening when the metal pipe string is stuck during oil and gas well construction. For this reason, we provide an explosive loosening device. Utility Model Content

[0004] The utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] To this end, the technical solution adopted in this utility model is:

[0006] An explosive release device, comprising:

[0007] An upper joint, wherein a hollow cavity is formed inside the upper joint, a buffer assembly is provided in the hollow cavity, a sealing pin is installed at the center position of the bottom end of the upper joint, and a pan head screw is threadedly connected at an eccentric position of the bottom end of the upper joint;

[0008] A union nut, the union nut being threadedly connected to the outer surface of the bottom end of the upper joint, the bottom end of the union nut being threadedly connected to a detonator cavity body, an electric detonator being installed inside the detonator cavity body, one leg wire at the top of the electric detonator being connected to a sealing pin, and another leg wire being connected to a pan head screw, a detonating cord being connected to the lower end of the electric detonator, and a sealing rubber plug joint being threadedly connected to the lower end of the detonator cavity body;

[0009] A connecting rod is threadedly connected to the inside of the sealing plug joint, the bottom end of the connecting rod is threadedly connected to the explosive rod, the bottom end of the explosive rod is threadedly connected to the rod tail, and a channel is opened inside the connecting rod, the detonating cord extends to the outside through the channel and is wrapped around the outer surface of the explosive rod.

[0010] Based on the above technical solution, its use principle and the technical effects produced are as follows:

[0011] When it is needed, first use the inner buckle at the top of the upper joint to connect with the lower end of the magnetic locator, then lower the device from the inside of the drill pipe into the well through the logging vehicle cable. According to the pre-measured drill string stuck point position, the device is transported to the first drill pipe joint thread above the stuck point through the positioning effect of the magnetic locator, the drill tool is pulled up and sufficient counter-torque is applied, and then the explosive loosening device is detonated. Due to the instantaneous high-speed impact force generated at the joint thread when the explosive explodes, the friction and self-locking property between the thread teeth disappear instantly or are greatly reduced, so that the joint thread is loosened under the action of the pre-applied counter-torque, thereby achieving the purpose of loosening at that point.

[0012] In a preferred example, the present invention can be further configured as follows: an inner buckle is provided on the top of the upper joint.

[0013] In a preferred example, the present invention can be further configured as follows: the buffer assembly includes an insulating sleeve installed inside the hollow cavity, an insulating cap is installed on the top of the insulating sleeve, an elastic retaining ring is installed between the top of the insulating cap and the hollow cavity, a contact is installed inside the insulating cap, and the contact extends into the interior of the insulating sleeve, the bottom end of the contact is connected to a compression spring, the bottom end of the compression spring is connected to a pad, and the compression spring and the pad are both located inside the insulating sleeve.

[0014] In a preferred example, the present invention can be further configured as follows: a core rod is installed at the center of the sealing pin, and the top end of the core rod is in contact with the cushion block.

[0015] In a preferred example, the present invention can be further configured as follows: a leg wire of the electric detonator is connected to the core rod in the sealing pin.

[0016] In a preferred example, the present invention can be further configured as follows: a first sealing ring is installed between the outer surface of the upper joint and the detonator cavity body, and the number of the first sealing rings is two.

[0017] In a preferred example, the present invention can be further configured as follows: a sealing plug body is provided at the center of the sealing plug joint, an inner center hole of the sealing plug joint is provided with an inclined step, and a detonating cord passes through the sealing plug joint and the sealing plug body.

[0018] In a preferred example, the present invention can be further configured as follows: a gasket is connected to the bottom of the sealing plug body, and the gasket is located on the top of the connecting rod.

[0019] In a preferred example, the present invention can be further configured as follows: two symmetrical radial screw holes are provided at the lower end of the sealing plug joint, and a fastening screw is installed in each screw hole.

[0020] In a preferred example, the present invention can be further configured as follows: the explosive rod is a metal rod, and the rod tail is configured as a cylindrical shape with an inverted cone at the lower end.

[0021] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0022] A fixed connection is a connection in which parts or components are fixed without any relative movement. There are two types of connections: detachable and non-detachable.

[0023] (1) A removable connection is a method of fastening components together using screws, splines, wedge pins, etc. This type of connection allows for disassembly during maintenance without damaging the components. However, the connectors used must be of the correct specifications (e.g., length of bolts, keys, wedge pins) and properly tightened.

[0024] (2) Non-detachable connections mainly refer to welding, riveting and tenoning. Since they need to be disassembled by forging, sawing or oxygen cutting when repairing or replacing, spare parts generally cannot be reused. At the same time, when making connections, attention should be paid to the quality of workmanship, technical inspection and remedial measures (such as calibration, polishing, etc.);

[0025] An active connection is a connection in which parts or components are fixed so that they can move relative to each other.

[0026] The above technical solution of the utility model has the following beneficial technical effects:

[0027] The utility model can realize the loosening of the drill pipe joint thread at the moment of explosive explosion, so as to achieve the purpose of reverse threading at the point, which can significantly reduce the difficulty and operation cost of explosive loosening operation and improve the construction timeliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional schematic diagram of the overall structure of the utility model.

[0029] Reference numerals:

[0030] 1. Upper connector; 2. Elastic retaining ring; 3. Insulating cap; 4. Contact; 5. Insulating sleeve; 6. Compression spring; 7. Spacer; 8. Union nut; 9. First sealing ring; 10. Pan head screw; 11. Sealing pin; 12. Electric detonator; 13. Detonator cavity body; 14. Sealing plug connector; 15. Sealing plug body; 16. Washer; 17. Fastening screw; 18. Connecting rod; 19. Exploding rod; 20. Detonating cord; 21. Protective cap; 22. Rod tail. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure. It should be noted that the embodiments of the present utility model and the features in the embodiments can be combined with each other in the absence of conflict.

[0032] According to the concept of this application, Figure 1 This article describes an embodiment of an explosive loosening device for resolving drill pipe sticking accidents during drilling operations. Specifically, the device is constructed as an integrated structure, comprising three components: an upper joint 1, a union nut 8, and a connecting rod 18. This device can loosen the threads of the drill pipe joint at the moment of explosive detonation, achieving the purpose of back-threading at that point. This significantly reduces the difficulty and cost of explosive loosening operations, improving timeliness and efficiency.

[0033] Combine Figure 1 As shown, the utility model provides an explosive release device, comprising:

[0034] The upper connector 1 has a hollow cavity formed inside, a buffer assembly is provided in the hollow cavity, a sealing pin 11 is installed at the center of the bottom end of the upper connector 1, and a pan head screw 10 is threadedly connected at an eccentric position at the bottom end of the upper connector 1;

[0035] A union nut 8 is threadedly connected to the outer surface of the bottom end of the upper joint 1. The bottom end of the union nut 8 is threadedly connected to the detonator cavity body 13. An electric detonator 12 is installed inside the detonator cavity body 13. One leg wire at the top of the electric detonator 12 is connected to the sealing pin 11, and the other leg wire is connected to the pan head screw 10. The lower end of the electric detonator 12 is connected to the detonating cord 20. The lower end of the detonator cavity body 13 is threadedly connected to the sealing plug joint 14;

[0036] The connecting rod 18 is threadedly connected to the inside of the sealing plug joint 14. The bottom end of the connecting rod 18 is threadedly connected to the explosive rod 19. The bottom end of the explosive rod 19 is threadedly connected to the rod tail 22. A channel is opened inside the connecting rod 18. The detonating cord 20 extends to the outside through the channel and is wrapped around the outer surface of the explosive rod 19. A protective cap 21 is provided at the end of the detonating cord 20.

[0037] According to the technical solution of this embodiment, the upper joint 1 is a multi-stage columnar body with an inner buckle provided at the upper end. The upper end is connected to the magnetic locator through the inner buckle. Through the positioning effect of the magnetic locator, the entire device can be transported to the first drill pipe joint thread above the stuck point.

[0038] According to the technical solution of this embodiment, the buffer assembly includes an insulating sleeve 5 installed inside the hollow cavity, an insulating cap 3 is installed on the top of the insulating sleeve 5, an elastic retaining ring 2 is installed between the top of the insulating cap 3 and the hollow cavity, a contact 4 is installed inside the insulating cap 3, and the contact 4 extends to the inside of the insulating sleeve 5, the bottom end of the contact 4 is connected to a compression spring 6, the bottom end of the compression spring 6 is connected to a pad 7, and the compression spring 6 and the pad 7 are both located inside the insulating sleeve 5.

[0039] When the upper connector 1 is connected to the magnetic locator, the contact 4 is in close contact with the elastic pin at the lower end of the magnetic locator to realize power conduction. After that, the current passes through the contact 4, compression spring 6, pad 7, and sealing pin 11 in sequence, and finally transmits the current to the electric detonator 12, thereby achieving the purpose of detonating the electric detonator 12, because one leg wire of the electric detonator 12 is connected to the core rod of the sealing pin 11, and the other leg wire is connected to the upper connector 1 of the device, which is equivalent to the positive and negative poles of the electric detonator 12.

[0040] According to the technical solution of this embodiment, a core rod is installed in the center of the sealing pin 11 , the top of the core rod is in contact with the pad 7 , and a leg wire of the electric detonator 12 is connected to the core rod in the sealing pin 11 .

[0041] It should be noted that the sealing pin 11 is a standard electronic component that is temperature-resistant and pressure-resistant. After being installed on the instrument, it can ensure that the insulation resistance between the core rod of the sealing pin and the instrument casing reaches more than 500MΩ, ensuring good current transmission.

[0042] According to the technical solution of this embodiment, a first sealing ring 9 is installed between the outer surface of the upper joint 1 and the detonator cavity body 13, and the number of the first sealing rings 9 is two. The provision of the first sealing ring 9 can enhance the sealing performance between the upper joint 1 and the detonator cavity body 13, thereby facilitating the formation of a closed cavity inside the detonator cavity body 13.

[0043] According to the technical solution of this embodiment, a sealing plug body 15 is provided at the center of the sealing plug joint 14, a central hole inside the sealing plug joint 14 is provided with an inclined step, and the detonating cord 20 passes through the sealing plug joint 14 and the sealing plug body 15, and a gasket 16 is connected to the bottom of the sealing plug body 15, and the gasket 16 is located at the top of the connecting rod 18.

[0044] According to the technical solution of this embodiment, two symmetrical radial screw holes are provided at the lower end of the sealing plug joint 14, and a fastening screw 17 is installed in each screw hole. The fastening screws 17 are provided to enhance the connection strength between the connecting rod 18 and the sealing plug joint 14.

[0045] According to the technical solution of this embodiment, the explosive rod 19 is a metal rod, and the rod tail 22 is set to be a cylindrical shape with an inverted cone at the lower end. The specific material of the metal rod is ordinary 45 steel. The metal rod plays a supporting role. Wrapping the detonating cord on the metal rod can prevent the detonating cord 20 from being scattered. The rod tail 22 plays a protective and guiding role. During the process of going down the well, the rod tail can prevent the detonating cord 20 from rubbing against the well wall. At the same time, the inverted cone design makes the overall device go down the well smoother.

[0046] Specifically, when it is needed, first use the inner buckle at the top of the upper joint 1 to connect with the lower end of the magnetic locator, then lower the device from the inside of the drill pipe into the well through the logging vehicle cable, and according to the pre-measured drill string stuck point position, through the positioning effect of the magnetic locator, transport the device to the first drill pipe joint thread above the stuck point, pull the drill tool and apply sufficient counter-torque, and then supply power to the electric detonator 12 through the logging cable core, the metal bridge wire inside the electric detonator 12 heats up and detonates the electric detonator 12, and the detonating cord 20 is detonated when the electric detonator 12 explodes. Since the high-speed impact force is instantly generated at the joint thread when the explosive explodes, the friction and self-locking property between the thread teeth disappear instantly or are greatly reduced, so that the joint thread is loosened under the action of the pre-applied counter-torque, thereby achieving the purpose of loosening the buckle at this point.

[0047] The explosive release device provided by the present invention is further described below with reference to the accompanying drawings and implementation examples.

[0048] An explosive release device, comprising:

[0049] The upper connector 1 has a hollow cavity formed inside, a buffer assembly is provided in the hollow cavity, a sealing pin 11 is installed at the center of the bottom end of the upper connector 1, and a pan head screw 10 is threadedly connected at an eccentric position at the bottom end of the upper connector 1;

[0050] A union nut 8 is threadedly connected to the outer surface of the bottom end of the upper joint 1. The bottom end of the union nut 8 is threadedly connected to the detonator cavity body 13. An electric detonator 12 is installed inside the detonator cavity body 13. One leg wire at the top of the electric detonator 12 is connected to the sealing pin 11, and the other leg wire is connected to the pan head screw 10. The lower end of the electric detonator 12 is connected to the detonating cord 20. The lower end of the detonator cavity body 13 is threadedly connected to the sealing plug joint 14;

[0051] The connecting rod 18 is threadedly connected to the inside of the sealing plug joint 14. The bottom end of the connecting rod 18 is threadedly connected to the explosive rod 19. The bottom end of the explosive rod 19 is threadedly connected to the rod tail 22. A channel is opened inside the connecting rod 18, and the detonating cord 20 extends to the outside through the channel and is wrapped around the outer surface of the explosive rod 19.

[0052] The working principle and usage process of the utility model are as follows: when it is needed, first use the inner buckle at the top of the upper joint 1 to connect with the lower end of the magnetic locator, then lower the device from the inside of the drill pipe into the well through the logging vehicle cable, and according to the drill string stuck point position measured in advance, through the positioning effect of the magnetic locator, transport the device to the first drill pipe joint thread above the stuck point, pull the drill tool and apply sufficient counter-torque, and then supply power to the electric detonator 12 through the logging cable core, the metal bridge wire inside the electric detonator 12 heats up and detonates the electric detonator 12, and the detonating cord 20 is detonated when the electric detonator 12 explodes. Since the high-speed impact force is instantly generated at the joint thread when the explosive explodes, the friction and self-locking property between the thread teeth disappear instantly or are greatly reduced, so that the joint thread is loosened under the action of the pre-applied counter-torque, thereby achieving the purpose of loosening the buckle at this point.

[0053] In the present invention, the term "plurality" refers to two or more than two, unless otherwise expressly defined. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items. Terms such as "installation", "connection", "connection", and "fixed" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0054] It should be noted that when an element is referred to as being "assembled to," "mounted to," "fixed to," or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0055] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An explosive release device, characterized in that: include: An upper joint (1), wherein a hollow cavity is provided inside the upper joint (1), a buffer assembly is provided in the hollow cavity, a sealing pin (11) is installed at the center position of the bottom end of the upper joint (1), and a pan head screw (10) is threadedly connected at an eccentric position of the bottom end of the upper joint (1); A union nut (8) is threadedly connected to the outer surface of the bottom end of the upper joint (1); the bottom end of the union nut (8) is threadedly connected to a detonator cavity body (13); an electric detonator (12) is installed inside the detonator cavity body (13); a leg wire at the top of the electric detonator (12) is connected to a sealing pin (11), and another leg wire is connected to a pan head screw (10); a detonating cord (20) is connected to the lower end of the electric detonator (12); and a sealing rubber plug joint (14) is threadedly connected to the lower end of the detonator cavity body (13); A connecting rod (18) is threadedly connected to the inside of the sealing plug joint (14); the bottom end of the connecting rod (18) is threadedly connected to an explosive rod (19); the bottom end of the explosive rod (19) is threadedly connected to a rod tail (22); and a channel is opened inside the connecting rod (18); a detonating cord (20) extends through the channel to the outside and is wrapped around the outer surface of the explosive rod (19).

2. The explosive release device according to claim 1, characterized in that: The top of the upper joint (1) is provided with an inner buckle.

3. The explosive release device according to claim 2, characterized in that: The buffer assembly comprises an insulating sleeve (5) installed inside the hollow cavity, an insulating cap (3) is installed on the top of the insulating sleeve (5), an elastic retaining ring (2) is installed between the top of the insulating cap (3) and the hollow cavity, a contact (4) is installed inside the insulating cap (3), and the contact (4) extends into the interior of the insulating sleeve (5), the bottom end of the contact (4) is connected to a compression spring (6), the bottom end of the compression spring (6) is connected to a pad (7), and the compression spring (6) and the pad (7) are both located inside the insulating sleeve (5).

4. The explosive release device according to claim 3, characterized in that: A core rod is installed at the center of the sealing pin (11), and the top end of the core rod is in contact with the cushion block (7).

5. The explosive release device according to claim 4, characterized in that: A leg wire of the electric detonator (12) is connected to a core rod in the sealing pin (11).

6. The explosive release device according to claim 5, characterized in that: A first sealing ring (9) is installed between the outer surface of the upper joint (1) and the detonator cavity body (13), and the number of the first sealing rings (9) is two.

7. The explosive release device according to claim 6, characterized in that: A sealing plug body (15) is provided at the center of the sealing plug joint (14), a central hole inside the sealing plug joint (14) is provided with an inclined step, and a detonating cord (20) passes through the sealing plug joint (14) and the sealing plug body (15).

8. The explosive release device according to claim 7, characterized in that: The bottom of the sealing plug body (15) is connected with a gasket (16), and the gasket (16) is located on the top of the connecting rod (18).

9. The explosive release device according to claim 8, characterized in that: The lower end of the sealing rubber plug joint (14) is provided with two symmetrical radial screw holes, and a fastening screw (17) is installed in each screw hole.

10. The explosive release device according to claim 9, characterized in that: The explosive rod (19) is a metal rod, and the rod tail (22) is configured as a cylindrical shape with an inverted cone at the lower end.

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